Makita 18V LXT Lithium-Ion Brushless Cordless 4-1/2 in./5 in. Cut-Off/Angle Grinder (Tool-Only) XAG04Z - The Home Depot
Makita Tools USA - Popular Mechanics reviewed 6 cordless grinders, and after two hours of grinding on steel plate the Makita was their favorite with 5 Stars (dislikes: NONE). Pick up their
MAKITA DGA504 18V Brushless Cordless Angle Grinder Bare Tool 125mm 5" Cut-Off Grinder Cutting Machine For MAKITA DGA504Z - AliExpress
Amazon.com: Makita DGA 504 Z DGA504Z 18v 125mm Brushless Angle Grinder Bare Unit, 18 V : Tools & Home Improvement
Makita dga504z dga504 125mm angle grinder with brushless motor and improved dust and moisture protection